title: Three-dimensional parallel particle manipulation and tracking by integrating holographic optical tweezers and engineered point spread functions.
abstract: We demonstrate an integrated holographic optical tweezers system with double-helix point spread function (DH-PSF) imaging for high precision three-dimensional multi-particle tracking. The tweezers system allows for the creation and control of multiple optical traps in three-dimensions, while the DH-PSF allows for high precision, 3D, multiple-particle tracking in a wide field. The integrated system is suitable for particles emitting/scattering either coherent or incoherent light and is easily adaptable to existing holographic tweezers systems. We demonstrate simultaneous tracking of multiple micro-manipulated particles and perform quantitative estimation of the lateral and axial forces in an optical trap by measuring the fluid drag force exerted on the particles. The system is thus capable of unveiling complex 3D force landscapes that make it suitable for quantitative studies of interactions in colloidal systems, biological materials, and a variety of soft matter systems.
authors.affiliation: Department of Electrical, Computer and Energy Engineering, University of Colorado, Boulder, CO 80309, USA. donald.conkey@colorado.edu
authors.forename: Donald B
authors.initials: DB
authors.lastname: Conkey
authors.forename: Rahul P
authors.initials: RP
authors.lastname: Trivedi
authors.forename: Sri Rama Prasanna
authors.initials: SR
authors.lastname: Pavani
authors.forename: Ivan I
authors.initials: II
authors.lastname: Smalyukh
authors.forename: Rafael
authors.initials: R
authors.lastname: Piestun
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006696:Holography / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D052898:Optical Tweezers; D010363:Pattern Recognition, Automated / Q000379:methods*; D041623:Tomography, Optical Coherence / Q000295:instrumentation*